Jack Herrick is sixteen, hard-working, and already carrying more responsibility than most boys his age. From the shabby but trusty Crystal Spring, he sells spring water to the crowded harbor of Greenhaven, where fishing boats, schooners, ferries, shipyards, and a motor launch all jostle for space and business. In this busy coastal world, Jack's practical skill and restless ambition keep him going, even as he worries about money, his dead father, and the education he has had to put aside. A thunder squall soon turns an ordinary day into a rescue at sea, when Jack hears a cry and tows in a disabled launch with two drenched boys aboard: Harry "Hal" Folsom and Beaman "Bee" Mansfield. Their friendship deepens as the three boys trade jokes, frustrations, and stories of near-disaster, including a disastrous first outing in Hal and Bee's own motorboat, the Corsair. As they chase rumors of buried treasure, investigate the eerie Tombstones and a sunken wreck near Nobody's Island, and run into comic misadventures like engine failures and a stripped boat, the story builds a spirited mix of seaside danger, mystery, and boyish adventure. This edition has been fully restored with modern typesetting, custom cover design.